The force said the arrest followed new information about an accomplice involved with Bellfield in the abduction and rape of Dowler, but not her murder.

Detectives say while they "thoroughly investigated" the claim, the man was subsequently released with no further action as no evidence was found to support the allegations.

However, during this investigation, police said they also spoke to Bellfield, who "has admitted his responsibility for the abduction, rape and murder of Milly Dowler".

Surrey Police launched Operation Ruby following the disappearance of Milly Dowler in 2002 when she was on her way home from school in Walton.

Milly Dowler (Image: PA)

In a statement, Milly's family said: "The Dowler family has been made aware of the recent arrest.

"They have been aware for some considerable time that a police investigation was taking place into the circumstances of the abduction and murder of Milly.

"The effect of this information has been devastating for a family which has already had to endure so much.

"We must stress how important it is that, notwithstanding this development, the Dowler family should be afforded privacy and space to go about their lives, and we are grateful for the consideration of the public and media in that regard."